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Pi Chamaeleontis is a binary star[13][14] system located in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from π Chamaeleontis, and abbreviated Pi Cha or π Cha. This system is dimly visible to the naked eye as a point of light with an apparent visual magnitude of 5.64.[2] Parallax measurements put the system approximately 144 light-years (44.2 pc) away.[1] It is drifting closer with a radial velocity of −10 km/s.[6]

The Hipparcos satellite mission derived a 223 d orbit on the basis of its motion caused by an unseen companion.[8] The visible component is an A-type subgiant[3] or F-type giant star with an effective temperature of about 6,900 K.[6] It has an absolute magnitude of 2.56,[7] a mass of 1.52 M☉,[9] and a radius of 2.2 R☉.[10] It is roughly 1.8 billion years old.[7]

References

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). “Gaia Data Release 3. Summary of the content and survey properties”. Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A…674A…1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). “Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures”. Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A…352..555A.
  3. ^ a b Houk, N.; Cowley, A. P. (1975). “University of Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume I. Declinations -90°.0 to -53°.0”. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. 1. Bibcode:1975mcts.book…..H.
  4. ^ Kharchenko, N. V.; et al. (2007). “Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations”. Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN….328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  5. ^ a b Johnson, H. L. (1966). “UBVRIJKL Photometry of the Bright Stars”. Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL…4…99J.
  6. ^ a b c d e Casagrande, L.; et al. (2011). “New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey”. Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A…530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
  7. ^ a b c d Holmberg, J.; et al. (2009). “The Geneva-Copenhagen survey of the solar neighbourhood”. Astronomy & Astrophysics. 501 (3): 941. arXiv:0811.3982. Bibcode:2009A&A…501..941H. doi:10.1051/0004-6361/200811191. S2CID 118577511.
  8. ^ a b van Leeuwen, F.; et al. (2007). “Validation of the new Hipparcos reduction”. Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A…474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  9. ^ a b c Lambert, David L.; Reddy, Bacham E. (2004). “Lithium abundances of the local thin disc stars”. Monthly Notices of the Royal Astronomical Society. 349 (2): 757. arXiv:astro-ph/0401259. Bibcode:2004MNRAS.349..757L. doi:10.1111/j.1365-2966.2004.07557.x. S2CID 118931004.
  10. ^ a b c Chandler, Colin Orion; et al. (2016). “The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars”. The Astronomical Journal. 151 (3): 59. arXiv:1510.05666. Bibcode:2016AJ….151…59C. doi:10.3847/0004-6256/151/3/59. S2CID 119246448.
  11. ^ Balachandran, Suchitra (1990). “Lithium depletion and rotation in main-sequence stars”. The Astrophysical Journal. 354: 310. Bibcode:1990ApJ…354..310B. doi:10.1086/168691.
  12. ^ “pi Cha”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-31.
  13. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). “A catalogue of multiplicity among bright stellar systems”. Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  14. ^ Bartkevicius, A.; Gudas, A. (2001). “Kinematics of Hipparcos Visual Binaries. I. Stars with Orbital Solutions”. Baltic Astronomy. 10 (4): 481–587. Bibcode:2001BaltA..10..481B. doi:10.1515/astro-2001-0402. S2CID 117700350.